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TM 5-4210-220-12
4-18. PUMP, PIPING, AND VALVES - Continued
(7) Visually inspect web (20), and if damaged, press it out of the tip (9) using an arbor press. If not damaged
proceed to step 10.
(8) Clamp button shaft (17) in a vise and remove jam nut (18).
(9) Unscrew web (20) from button shaft (17). Discard web.
(10) Remove nut (21) from setscrew (22).
(11) Pull the housing (10) off the tip and remove O-ring (12). Discard O-ring.
(12) Remove setscrew (22) from the tip (9).
NOTE
Small lime deposits can be dissolved by soaking parts in acetic acid (item 1, Appendix E) and
rubbing them gently with a brass bristle brush.
(13) Remove lime deposits, corrosion from all components using a brass bristle brush.
(14) Wipe all components using a soft, dry, lint free cloth.
(15) Inspect components for corrosion, cracks, or stripped or worn threads.
(16) Evidence of damage of any kind is cause for rejection. Replace component or assembly as required.
(17) If web (20) has been removed, press new web into tip (9) through inlet end. Be sure the machined face
of the web is installed first.
(18) Apply threadlock liquid (item 29, Appendix E) to the threads of the setscrew (22) and install into tip (9).
Tighten firmly.
(19) Wipe excess threadlock liquid (item 29, Appendix E) from hexagon socket setscrew (22) and install one
nut (21). Tighten until nut reaches tip boss (9).
(20) Lubricate O-ring (12) using silicone grease (item 27, Appendix E) and install into groove on tip (9).
(21) Align housing (10) with tip (9) and setscrew (22) and slide into place.
(22) Install the second nut (21) onto the setscrew (22).
(23) Position nuts (21) to allow housing (10) to be completely retracted on the tip (9). Tighten nuts (21)
firmly.
(24) Attach button (14) to button shaft (17) using lockwasher (16) and jam nut (15). Tighten jam nut to 7 ft lb
(10 Nm).
(25) Apply threadlock liquid (item 29, Appendix E) to threads of button shaft (17). Install into web (20) until
button measures 0.75 in. (19 mm) from the housing tip as shown.
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